DOCSLIB.ORG

Seven Layers of Osi Reference Model

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Seven Layers of Osi Reference Model SEVEN LAYERS OF OSI REFERENCE MODEL 1. Physical Layer: physical layer is the bottom layer of the OSI reference model. The physical layer has four improtant characteristics. Mechanical. Relates to the physical properties of the interface to a transmission medium. Typically, the specification is of a pluggable connector that joins one or more signal conductors, called circuits. Electrical. Relates to the representation of bits (e.g., in terms of voltage levels) and the data transmission rate of bits. It defines the voltage, current, modulation, bit synchronization, connection activation and deactivation, and various electrical characteristics for the transmission media (such as unshielded or shielded twisted-pair cabling, coaxial cabling, and fiber-optic cabling). Functional. Specifies the functions performed by individual circuits of the physical interface between a system and the transmission medium. Procedural. Specifies the sequence of events by which bit streams are exchanged across the physical medium. 2. Data Link Layer: The physical layer provides only a raw bit-stream service, the data link layer attempts to make the physical link reliable while providing the means to activate, maintain, and deactivate the link . For LANs, the Project 802 standards of the Institute of Electrical and Electronics Engineers (IEEE) separate the data-link layer into two sublayers: • The logical link control (LLC) layer, the upper of the two layers, which is responsible for flow control, error correction, and resequencing functions for connection-oriented communication, but which also supports connectionless communication • The media access control (MAC) layer, the lower of the two layers, which is responsible for providing a method for stations to gain access to the medium Functions: Framing. The data link layer divides the stream of bits received from the network layer into manageable data units called frames. Physical addressing. If frames are to be distributed to different systems on the network, the data link layer adds a header to the frame to define the sender and/or receiver of the frame. If the frame is intended for a system outside the sender's network, the receiver address is the address of the device that connects the network to the next one. Flow control. If the rate at which the data are absorbed by the receiver is less than the rate at which data are produced in the sender, the data link layer imposes a flow control mechanism to avoid overwhelming the receiver. Error control. The data link layer adds reliability to the physical layer by adding mechanisms to detect and retransmit damaged or lost frames. It also uses a mechanism to recognize duplicate frames. Error control is normally achieved through a trailer added to the end of the frame. Access control. When two or more devices are connected to the same link, data link layer protocols are necessary to determine which device has control over the link at any given time Examples of data-link protocols for local area networking include the following: • IEEE 802.3, which provides the Carrier Sense Multiple Access with Collision Detection (CSMA/CD) access method for baseband Ethernet networks • IEEE 802.5, which provides the token-passing access method for baseband token ring implementations For WANs, data-link layer protocols encapsulate LAN traffic into frames suitable for transmission over WAN links. Common data-link encapsulation methods for WAN transmission include the following: • Point-to-point technologies such as Point-to-Point Protocol (PPP) and High-level Data Link Control (HDLC) protocol • Multipoint technologies such as frame relay, Asynchronous Transfer Mode (ATM), Switched Multimegabit Data Services (SMDS), and X.25 3. Network Layer: Layer 3 of the Open Systems Interconnection (OSI) reference model for networking. The network layer is responsible for functions such as the following: • Logical addressing and routing of packets over the network • Establishing and releasing connections and paths between two nodes on a network • Transferring data, generating and confirming receipts, and resetting connections The network layer also supplies connectionless and connection-oriented services to the transport layer above it. The network layer functions closely with the physical layer (layer 1) and data-link layer (layer 2) in most real- world network protocol implementations. On TCP/IP-based networks, IP addresses and network numbers are used at the network layer, and IP routers perform their routing functions at this layer. An example of an OSI model network layer protocol is the X.25 packet-switching network layer protocol, which is built on the X.21 physical layer protocol. 4. Transport Layer: Layer 4 of the Open Systems Interconnection (OSI) reference model. The transport layer is responsible for providing reliable transport services to the upper-layer protocols. These services include the following: • Flow control to ensure that the transmitting device does not send more data than the receiving device can handle. • Packet sequencing for segmentation of data packets and remote reassembly. • Error handling and acknowledgments to ensure that data is retransmitted when required. • Multiplexing for combining data from several sources for transmission over one data path. • Virtual circuits for establishing sessions between communicating stations. The Transmission Control Protocol (TCP) of the TCP/IP protocol suite resides at the transport layer. A connection between two devices that acts as though it's a direct connection even though it may physically be circuitous. The term is used most frequently to describe connections between two hosts in a packet-switching network. In this case, the two hosts can communicate as though they have a dedicated connection even though the packets might actually travel very different routes before arriving at their destination. An X.25 connection is an example of a virtual circuit. Virtual circuits can be either permanent (called PVCs) or temporary (called SVCs). 5. Session Layer: Layer 5 of the Open Systems Interconnection (OSI) reference model, which enables sessions between computers on a network to be established and terminated. The session layer does not concern itself with issues such as the reliability and efficiency of data transfer between stations because these functions are provided by the first four layers of the OSI reference model. Functions: Dialog control: The session layer allows two systems to enter into a dialog. It allows the communication between two processes to take place in either half- duplex (one way at a time) or full-duplex (two ways at a time) mode. Synchronization: The session layer allows a process to add checkpoints, or synchronization points, to a stream of data. For example, if a system is sending a file of 2000 pages, it is advisable to insert checkpoints after every 100 pages to ensure that each 100-page unit is received and acknowledged independently. In this case, if a crash happens during the transmission of page 523, the only pages that need to be resent after system recovery are pages 501 to 523. Pages previous to 501 need not be resent. 6. Presentation Layer: The presentation layer is concerned with the syntax and semantics of the information exchanged between two systems . Specific responsibilities of the presentation layer include the following: Translation. The processes (running programs) in two systems are usually exchanging information in the form of character strings, numbers, and so on. The information must be changed to bit streams before being transmitted. Because different computers use different encoding systems, the presentation layer is responsible for interoperability between these different encoding methods. The presentation layer at the sender changes the information from its sender-dependent format into a common format. The presentation layer at the receiving machine changes the common format into its receiver-dependent format. Encryption. To carry sensitive information, a system must be able to ensure privacy. Encryption means that the sender transforms the original information to another form and sends the resulting message out over the network. Decryption reverses the original process to transform the message back to its original form. Compression. Data compression reduces the number of bits contained in the information. Data compression becomes particularly important in the transmission of multimedia such as text, audio, and video. 7. Application layer: Layer 7 of the Open Systems Interconnection (OSI) reference model, in which network-aware, user-controlled software is implemented—for example, e-mail, file transfer utilities, and terminal access. The application layer represents the window between the user and the network. Examples of protocols that run at the application layer include File Transfer Protocol (FTP), Hypertext Transfer Protocol (HTTP), telnet, and similar protocols that can be implemented as utilities the user can interface with. File transfer, access, and management. This application allows a user to access files in a remote host (to make changes or read data), to retrieve files from a remote computer for use in the local computer, and to manage or control files in a remote computer locally. Mail services. This application provides the basis for e-mail forwarding and storage. Directory services. This application provides distributed database sources and access for global information about various objects and services. Summary: Physical Layer: How to transmit bits. Data Link Layer: How to transmits frames Network: How to route packets to the node. Transport: How to send packets to the applications. Session: Manage connections. Presentation: Encode/Decode messages, security. Application: Everything else. Devices and Protocols on each Layer: Layer Protocols Devices Physical Hub, Repeater, Cables Data-link LLC,MAC,Ethernet Switch Network IP,Routing protocol(RIP, OSPF) Router Transport TCP,UDP Session Presentation ASCII,Encryption, Decryption Application DNS,NFS,TELNET,NFS.
Load more

Recommended publications
  • OSI Model and Network Protocols
    CHAPTER4 FOUR OSI Model and Network Protocols Objectives 1.1 Explain the function of common networking protocols . TCP . FTP . UDP . TCP/IP suite . DHCP . TFTP . DNS . HTTP(S) . ARP . SIP (VoIP) . RTP (VoIP) . SSH . POP3 . NTP . IMAP4 . Telnet . SMTP . SNMP2/3 . ICMP . IGMP . TLS 134 Chapter 4: OSI Model and Network Protocols 4.1 Explain the function of each layer of the OSI model . Layer 1 – physical . Layer 2 – data link . Layer 3 – network . Layer 4 – transport . Layer 5 – session . Layer 6 – presentation . Layer 7 – application What You Need To Know . Identify the seven layers of the OSI model. Identify the function of each layer of the OSI model. Identify the layer at which networking devices function. Identify the function of various networking protocols. Introduction One of the most important networking concepts to understand is the Open Systems Interconnect (OSI) reference model. This conceptual model, created by the International Organization for Standardization (ISO) in 1978 and revised in 1984, describes a network architecture that allows data to be passed between computer systems. This chapter looks at the OSI model and describes how it relates to real-world networking. It also examines how common network devices relate to the OSI model. Even though the OSI model is conceptual, an appreciation of its purpose and function can help you better understand how protocol suites and network architectures work in practical applications. The OSI Seven-Layer Model As shown in Figure 4.1, the OSI reference model is built, bottom to top, in the following order: physical, data link, network, transport, session, presentation, and application.
    [Show full text]
  • OSI Model: the 7 Layers of Network Architecture
    OSI Model: The 7 Layers of Network Architecture The Open Systems Interconnection (OSI) Reference Model is a conceptual framework that describes functions of the networking or telecommunication system independently from the underlying technology infrastructure. It divides data communication into seven abstraction layers and standardizes protocols into appropriate groups of networking functionality to ensure interoperability within the communication system regardless of the technology type, vendor, and model. The OSI model was originally developed to facilitate interoperability between vendors and to define clear standards for network communication. However, the olderTCP/IP model remains the ubiquitous reference framework for Internet communications today. The 7 layers of the OSI model This image illustrates the seven layers of the OSI model. Below, we’ll briefly describe each layer, from bottom to top. 1. Physical The lowest layer of the OSI model is concerned with data communication in the form of electrical, optic, or electromagnetic signals physically transmitting information between networking devices and infrastructure. The physical layer is responsible for the communication of unstructured raw data streams over a physical medium. It defines a range of aspects, including: Electrical, mechanical, and physical systems and networking devices that include specifications such as cable size, signal frequency, voltages, etc. Topologies such as Bus, Star, Ring, and Mesh Communication modes such as Simplex, Half Duplex, and Full Duplex Data transmission performance, such as Bit Rate and Bit Synchronization Modulation, switching, and interfacing with the physical transmission medium Common protocols including Wi-Fi, Ethernet, and others Hardware including networking devices, antennas, cables, modem, and intermediate devices such as repeaters and hubs 2.
    [Show full text]
  • Medium Access Control Layer
    Telematics Chapter 5: Medium Access Control Sublayer User Server watching with video Beispielbildvideo clip clips Application Layer Application Layer Presentation Layer Presentation Layer Session Layer Session Layer Transport Layer Transport Layer Network Layer Network Layer Network Layer Univ.-Prof. Dr.-Ing. Jochen H. Schiller Data Link Layer Data Link Layer Data Link Layer Computer Systems and Telematics (CST) Physical Layer Physical Layer Physical Layer Institute of Computer Science Freie Universität Berlin http://cst.mi.fu-berlin.de Contents ● Design Issues ● Metropolitan Area Networks ● Network Topologies (MAN) ● The Channel Allocation Problem ● Wide Area Networks (WAN) ● Multiple Access Protocols ● Frame Relay (historical) ● Ethernet ● ATM ● IEEE 802.2 – Logical Link Control ● SDH ● Token Bus (historical) ● Network Infrastructure ● Token Ring (historical) ● Virtual LANs ● Fiber Distributed Data Interface ● Structured Cabling Univ.-Prof. Dr.-Ing. Jochen H. Schiller ▪ cst.mi.fu-berlin.de ▪ Telematics ▪ Chapter 5: Medium Access Control Sublayer 5.2 Design Issues Univ.-Prof. Dr.-Ing. Jochen H. Schiller ▪ cst.mi.fu-berlin.de ▪ Telematics ▪ Chapter 5: Medium Access Control Sublayer 5.3 Design Issues ● Two kinds of connections in networks ● Point-to-point connections OSI Reference Model ● Broadcast (Multi-access channel, Application Layer Random access channel) Presentation Layer ● In a network with broadcast Session Layer connections ● Who gets the channel? Transport Layer Network Layer ● Protocols used to determine who gets next access to the channel Data Link Layer ● Medium Access Control (MAC) sublayer Physical Layer Univ.-Prof. Dr.-Ing. Jochen H. Schiller ▪ cst.mi.fu-berlin.de ▪ Telematics ▪ Chapter 5: Medium Access Control Sublayer 5.4 Network Types for the Local Range ● LLC layer: uniform interface and same frame format to upper layers ● MAC layer: defines medium access ..
    [Show full text]
  • ADD WES/OSN CH 11 5Thprf
    THE PRESENTATION AND 11 SESSION LAYERS The presentation and session layers collaborate to provide many of the distributed-processing capabilities presented to user elements by the ser- vice elements of the application layer; for this reason, they are discussed together. Presentation Layer Chapter 4 describes how ASN.1 provides the application programmer with a tool for creating data structures that are syntactically independent from the way in which data are stored in a computer and from the way in which they are transferred between computer systems. Transforming these abstract syntaxes into “concrete” data structures appropriate for a given operating system (e.g., UNIX, DOS, VMS, MVS) is typically han- dled by tools such as ASN.1 compilers. The task of preserving the seman- tics of the data exchanged between a sender and receiver across an OSI network is handled by the presentation layer, which performs the trans- formations from the local (concrete) syntax used by each application entity to a common transfer syntax. This leads us to the discussion of the notion of a presentation context set. Context Set The presentation layer is responsible for managing the transfer syntaxes Definition associated with the set of abstract syntaxes that will be used by applica- tion entities as they exchange information across a presentation connec- tion. As part of presentation connection establishment, application enti- ties must be sure that the presentation layer can support a transfer syntax 247 248 OPEN SYSTEMS NETWORKING: TCP/IP AND OSI for every abstract syntax required by the distributed-processing applica- tion(s) that will use this connection.
    [Show full text]
  • 1.2. OSI Model
    1.2. OSI Model The OSI model classifies and organizes the tasks that hosts perform to prepare data for transport across the network. You should be familiar with the OSI model because it is the most widely used method for understanding and talking about network communications. However, remember that it is only a theoretical model that defines standards for programmers and network administrators, not a model of actual physical layers. Using the OSI model to discuss networking concepts has the following advantages: Provides a common language or reference point between network professionals Divides networking tasks into logical layers for easier comprehension Allows specialization of features at different levels Aids in troubleshooting Promotes standards interoperability between networks and devices Provides modularity in networking features (developers can change features without changing the entire approach) However, you must remember the following limitations of the OSI model: OSI layers are theoretical and do not actually perform real functions. Industry implementations rarely have a layer‐to‐layer correspondence with the OSI layers. Different protocols within the stack perform different functions that help send or receive the overall message. A particular protocol implementation may not represent every OSI layer (or may spread across multiple layers). To help remember the layer names of the OSI model, try the following mnemonic devices: Mnemonic Mnemonic Layer Name (Bottom to top) (Top to bottom) Layer 7 Application Away All Layer 6 Presentation Pizza People Layer 5 Session Sausage Seem Layer 4 Transport Throw To Layer 3 Network Not Need Layer 2 Data Link Do Data Layer 1 Physical Please Processing Have some fun and come up with your own mnemonic for the OSI model, but stick to just one so you don't get confused.
    [Show full text]
  • ISO/OSI Model SSL: Security at Transport Layer
    ISO/OSI Model SSL: Security at Transport Layer Peer-to-peer Application Layer Application Layer Presentation Layer Presentation Layer Network Security Session Layer Session Layer Assurance Transport Layer Transport Layer Network Layer Network Layer Network Layer Lecture 9 Data Link Layer Data Link Layer Data Link Layer Physical Layer Physical Layer Physical Layer October 30, 2003 Flow of bits Courtesy of Professors INFSCI 2935: Introduction of Computer Security 1 INFSCI 2935: Introduction to Computer Security 2 Chris Clifton & Matt Bishop 1 Security at the Transport Layer Secure Socket Layer (SSL) Secure Socket Layer (SSL) l Developed by Netscape to provide security in l Each party keeps session information ¡ Session identifier (unique) WWW browsers and servers ¡ The peer’s X.503(v3) certificate l SSL is the basis for the Internet standard ¡ Compression method used to reduce volume of data ¡ Cipher specification (parameters for cipher and MAC) protocol – Transport Layer Security (TLS) ¡ Master secret of 48 bits protocol (compatible with SSLv3) l Connection information ¡ Random data for the server & client l Key idea: Connections and Sessions ¡ Server and client keys (used for encryption) ¡A SSL session is an association between two peers ¡ Server and client MAC key ¡An SSL connection is the set of mechanisms used to ¡ Initialization vector for the cipher, if needed ¡ Server and client sequence numbers transport data in an SSL session l Provides a set of supported cryptographic mechanisms that are setup during negotiation (handshake protocol)
    [Show full text]
  • Seven Layer OSI Model
    InternationalInternational StandardsStandards OrganizationOrganization OpenOpen SystemsSystems InterconnectInterconnect (OSI)(OSI) ReferenceReference ModelModel Networks: OSI Reference Model 1 Application A Application B Application Application Layer Layer Presentation Presentation Layer Layer Session Session Layer Layer Transport Transport Layer Communication Network Layer Network Network Network Network Layer Layer Layer Layer Data Link Data Link Data Link Data Link Layer Layer Layer Layer Physical Physical Physical Physical Layer Layer Layer Layer Copyright ©2000 The McGraw Hill Companies Electrical and/or Optical Signals Leon-Garcia & Widjaja: Communication Networks Figure 2.6 Networks: OSI Reference Model 2 Copyright ©2000 The McGraw Hill Companies Leon-Garcia & Widjaja: Communication Networks Figure 2.9 Application A Application B data Application Application Layer data ah Layer Presentation Presentation Layer data ph Layer Session Session Layer data sh Layer Transport th Transport Layer data Layer Network Network Layer data nh Layer Data Link Data Link Layer dt data dh Layer Physical Physical Layer bits Layer Networks: OSI Reference Model 3 HTTP Request Header contains source and TCP destination port numbers Header Header contains source and destination IP addresses; IP transport protocol type Header Header contains source Frame and destination physical Ethernet addresses; network Check protocol type Header Sequence Copyright ©2000 The McGraw Hill Companies Leon-Garcia & Widjaja: Communication Networks Figure 2.15 Networks: OSI Reference Model 4 OSIOSI versusversus TCP/IPTCP/IP Figure 1-21. The TCP/IP reference model. Networks: OSI Reference Model 5 OSIOSI versusversus TCP/IPTCP/IP DCCDCC 66th Ed.,Ed., W.W. StallingsStallings FigureFigure 1.111.11 Networks: OSI Reference Model 6 SevenSeven LayerLayer OSIOSI ModelModel Application Layer Provides users access to the OSI environment and distributed information services.services.
    [Show full text]
  • OSI & LMS Final Project.Pptx
    OSI Layers and the Learning Over view Management System A Learning Management System is an applicaon located on a local network or the Internet, developed for the employment of electronic educaonal technology by students across distances from a building with mul7ple rooms to the world wide community. Student Registraon Repository Live Chat Live Video Seminars Tests LMS E-mail NETWORK OF USERS Test Scores & Records Courses USER Course Schedule Learner Progress Tracker Learning Content Management System OSI Layers and the Learning Physical Layer Management System DEVICE DEVICE CABLE MODEM FREQUENCY CABLE The physical layer supports the actual movement of bits and volts between devices (smart phone, computer, tablet, modem, repeater) through copper wire, fiber op7c cable, radio frequencies, or any other medium used to transmit data by a MODEM physical means. The physical layer is not concerned with the structure or organizaon of data, it is simply transming and receiving the data. Some devices func7on on other layers of the OSI model, so they do not fit neatly into physical layer because they conduct a CABLE func7on beyond simply moving bits and volts. However, all devices par7ally operate CABLE in the physical layer, but it is their primary func7on that solidly places them in one of CABLE REPEATER the other layers. REPEATER MODEM DEVICE OSI Layers and the Learning Data Link Layer Management System WIDE AREA NETWORK or LOCAL AREA NETWORK NODE NODE NIC NIC FRAMES—FRAMES—FRAMES—FRAMES FRAMES—FRAMES—FRAMES SWITCH / BRIDGE The data link layer is divided into two sub-layers; Logical Link Control (LLC) and Media Access Control (MAC).
    [Show full text]
  • Session Layer OSI Reference Model Fatih SÜRER 2010514060
    13.4.2015 OSI LAYER 5 - Session Layer OSI Reference Model Fatih SÜRER 2010514060 2 Review of the First Four Layer 3 4 Session Layer In the seven-layer OSI model of computer networking , the session layer is layer 5. This layer is primarily concerned with coordinating applications as they interact on different hosts. Support the dialog between cooperating application programs The session layer offers provisions for efficient data transfer. The session layer decides when to turn communication on and off between two computer Provides duplex, half-duplex, or simplex communications between devices. 5 6 1 13.4.2015 Session Layer Cont. The Session Layer provides services that allow to establish/manage/terminate a session-connection, to support orderly data exchange, to organize and to synchronize the dialogue and to release the connection in an orderly manner. The session’s layer objective is to hide the possible failures of transport-level connections to the upper layer higher. 7 8 Session Layer Cont. Session Layer Cont. Session layer provides a name space that is used to tie together the Sessions offer various services, including dialog potentially different transport streams that are part of a single control (keeping track of whose turn it is to application. For example, it might manage an audio stream and a video stream that are being combined in a teleconferencing transmit), token management (preventing two application. long story short, principal task of the session layer is parties from attempting the same critical operation to connect two processes together into a session. simultaneously), and synchronization (checkpointing The session layer whose overall function is to ensure the end to end integrity of the applications that are being supported.
    [Show full text]
  • The Seven Layers of OSI the OSI Model Was Created to Impose A
    The Seven Layers of OSI 1 The OSI model was created to impose a standardised from of networking, because up till the point it was introduced every computer company would have different network protocol. This meant that you couldn't buy computers from more than one company and expect them to work, because the computers wouldn't understand how each other coded and decoded the binary code that travels through the given network media. Layer 1 - Physical Layer: The physical layer encompasses all physical components and media used during data transfer in a network. This includes, but is not limited to, cables, switches, network cards and routers. Data transferred on the level of the Physical layer is in binary. Layer 2 - Data Link Layer This layer codes and decodes the bits being transferred by the physical layer. The data link layer frames the packets of data that are sent and checks for errors in the data. Layer 3 - Network Layer This layer determines the fastest route for data to travel to its destination and routes it as such. The network layer also handles a certain amount of error checking. Layer 4 - Transport Layer This layer determines the end to end transfer and it checks the data transfer was completed error free. End to end refers to the computers at each end of the cable/WI-FI. Layer 5 - Session Layer This layer establishes, manages and terminates connections between applications. The session layer also reports upper layer errors. Layer 6 - Presentation Layer This layer formats, encrypts and decrypts data to being sent and received by computers in a network.
    [Show full text]
  • Medium Access Control Sublayer
    Telematics Chapter 5: Medium Access Control Sublayer User Server watching with video Beispielbildvideo clip clips Application Layer Application Layer Presentation Layer Presentation Layer Session Layer Session Layer Transport Layer Transport Layer Network Layer Network Layer Network Layer Prof. Dr. Mesut Güneş Data Link Layer Data Link Layer Data Link Layer Computer Systems and Telematics (CST) Physical Layer Physical Layer Physical Layer Distributed, embedded Systems Institute of Computer Science Freie Universität Berlin http://cst.mi.fu-berlin.de Contents ● Design Issues ● Metropolitan Area Networks ● Network Topologies (()MAN) ● The Channel Allocation Problem ● Wide Area Networks (WAN) ● Multiple Access Protocols ● Frame Relay ● Ethernet ● ATM ● IEEE 802.2 – Logical Link Control ● SDH ● Token Bus ● Network Infrastructure ● Token Ring ● Virtual LANs ● Fiber Distributed Data Interface ● Structured Cabling Prof. Dr. Mesut Güneş ▪ cst.mi.fu-berlin.de ▪ Telematics ▪ Chapter 5: Medium Access Control Sublayer 5.2 Design Issues Prof. Dr. Mesut Güneş ▪ cst.mi.fu-berlin.de ▪ Telematics ▪ Chapter 5: Medium Access Control Sublayer 5.3 Design Issues ● Two kinds of connections in networks ● Point-to-point connections OSI Reference Model ● Broadcast (Multi-access channel, Application Layer Random access channel) Presentation Layer ● In a network with broadcast Session Layer connections ● Who gets the channel? Transport Layer Network Layer ● PtProtoco ls use dtdtd to determ ine w ho gets next access to the channel Data Link Layer ● Medium Access Control (()MAC) sublay er Phy sical Laye r Prof. Dr. Mesut Güneş ▪ cst.mi.fu-berlin.de ▪ Telematics ▪ Chapter 5: Medium Access Control Sublayer 5.4 Network Types for the Local Rang e ● LLC layer: uniform interface and same frame format to upper layers ● MAC layer: defines medium access - LLC IEEE 802.2 Logical Link Control ..
    [Show full text]
  • Media Access Control Protocols in Local Area Networks / Paresh Shah Lehigh University
    Lehigh University Lehigh Preserve Theses and Dissertations 1986 Media access control protocols in local area networks / Paresh Shah Lehigh University Follow this and additional works at: https://preserve.lehigh.edu/etd Part of the Electrical and Computer Engineering Commons Recommended Citation Shah, Paresh, "Media access control protocols in local area networks /" (1986). Theses and Dissertations. 4652. https://preserve.lehigh.edu/etd/4652 This Thesis is brought to you for free and open access by Lehigh Preserve. It has been accepted for inclusion in Theses and Dissertations by an authorized administrator of Lehigh Preserve. For more information, please contact [email protected]. Media Access Control Protocols • Ill Local Area Networks \ by Paresh Shah A Thesis Presented to the Graduate Committee of Lehigh University in Candidacy for the Degree of Master of Science . )Il Comp·uter Science Lehigh University 1986 This thesis is accepted and approved in partial fulfillment of t·he· re·qJXite~ ments for the Degree of Master of Science . .. Chai..rma·:n· CSEE Department ... 11 Acknowledgments I would like to take this time to acknowledge all those who have helped to bring about this thesis and the various concepts that are expressed. Initially, .I would like to thank rny parents for their years of support, guidance, love and understanding without which 1 could not have produced this thesis. I would like to thank Prof. Kenneth Tzeng for being a caring teacher and advisor during the research of this thesis. I would also like to thank Prof. Richard Denton for providing the necessary background material. Finally, I would like to thank all my friends and fellow graduate students who supported me during the research.
    [Show full text]